package com.atguigu.gulimall.gulimallproduct.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.gulimallproduct.dao.CategoryDao;
import com.atguigu.gulimall.gulimallproduct.entity.CategoryEntity;
import com.atguigu.gulimall.gulimallproduct.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listTree() {
        //1.查出所有
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //2.组装树状结构
        //2.1过滤所有一级并设置子集
        List<CategoryEntity> leveOneMenus = entities.stream().filter((categoryEntity -> categoryEntity.getParentCid() == 0))
                .map((menu)->{
                     menu.setChildList(getChildren(menu,entities));
                     return menu;
                }).sorted((menu1,menu2)->{
                    return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
                }).collect(Collectors.toList());


        return leveOneMenus;
    }
    //获取当前菜单的所有子菜单
    public List<CategoryEntity> getChildren(CategoryEntity curl,List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid() == curl.getCatId();
        }).map((menu)->{
            menu.setChildList(getChildren(menu,all));
            return menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }

}